Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details 2)

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Basis of Presentation (Details 2)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of fair-value options awarded to employees and directors        
Risk-free interest rate 0.90% 2.40% 1.00% 2.50%
Dividend yield            
Expected volatility 69.00% 68.00% 69.00% 69.00%
Expected term 6 years 3 months 18 days 6 years 1 month 6 days 6 years 3 months 18 days 6 years 1 month 6 days
Forfeiture rate 8.00% 9.40%    
Forfeiture rate, minimum     8.00% 9.40%
Forfeiture rate, maximum     11.20% 14.10%